Pool Volume Calculator

Find how many litres or gallons a swimming pool holds, for dosing chemicals and sizing pumps.

Units	Imperial (ft, in)
Shape	Rectangle
Length or diameter	32 ft
Width	16 ft
Shallow end depth	3.5 ft
Deep end depth	6.5 ft

Units

Shape

Length or diameter

Width

Shallow end depth

Deep end depth

Pool volume

19,150 US gal

72.49 m³ = 72,491 litres = 19,150 US gallons = 15,946 imperial gallons, at an average depth of 5 ft.

Surface area: 512 ft²
Average depth: 5 ft

Side view along the pool

About the Pool Volume Calculator

Choose the shape (rectangle, round or oval) and enter the length or diameter, the width and the depth at the shallow and deep ends. The calculator gives the volume in litres, cubic metres and US and imperial gallons, the surface area and the average depth.

Volume is the surface area times the average depth. For a sloping floor, average the shallow and deep ends. One cubic metre holds 1,000 litres; one cubic foot holds 7.48 US gallons.

The formula

V = surface area × (shallow + deep) ÷ 2

Worked example

A 10 × 5 m pool, 1 m deep at one end and 2 m at the other

Surface area: 50 m²; average depth 1.5 m
Volume: 50 × 1.5 = 75 m³
= 75,000 litres = 19,813 US gallons

Questions people ask

How long to fill a pool?

Divide the volume by your hose flow, often 20–40 L (5–10 gal) a minute.

How often should water turn over?

Pumps usually circulate the full volume every 6–8 hours.

Should I fill to the top?

Usually to the middle of the skimmer opening, so subtract a few centimetres from the depth.